盐酸用量对Al-SBA-15介孔分子筛性质和加氢裂化性能的影响

以异丙醇铝为铝源,正硅酸乙酯为硅源,在不同含量的盐酸介质中,采用一步直接合成法合成介孔分子筛Al-SBA-15,并制成催化剂,采用XRD、N_2吸附-脱附、SEM、TEM、~(27)Al MAS NMR和NH_3-TPD等方法对分子筛和催化剂进行了表征,并对催化剂进行了性能评价。结果表明:加入20g盐酸时,Al-SBA-15介孔分子筛具有高度有序的六方结构,其酸性较强;以介孔分子筛Al-SBA-15作载体制备的加氢裂化催化剂具有较好的重油加氢裂化性能,中间馏分油选择性达87.3%,中间馏分油收率达60.8%,且产品性能较优,可用于生产优质柴油和喷气燃料,也可为重整和裂解制乙烯装置提供优质原料。

INFLUENCE OF HCl ACID ON PROPERTIES AND HYDROCRACKING PERFORMANCE OF Al-SBA-15 MESOPOROUS MOLECULAR SIEVE

Using aluminium isopropoxide as aluminum source, TEOS as silicon source, a series of mesoporous molecular sieves of Al-SBA-15 was synthesized directly by one-step method in an acid medium with different amount of hydrochloric acid, followed by preparation of Ni-W hydrocracking catalysts. The molecular sieves and the catalysts were then analyzed by XRD，N2 adsorption and desorption，SEM，TEM and infrared spectrum. The results indicate that the Al-SBA-15 mesoporous molecular sieves have a highly ordered hexagonal structure with a strong acidity when 20 g hydrochloric acid was used in the acid medium. The heavy oil hydrocracking performance of the catalysts was evaluated and compared with the reference. The experimental results reveal that the selectivity and yield of middle distillate of the catalyst containing Al-SBA-15 mesoporous molecular sieves reaches 87.3% and 60.8%, respectively. The catalyst can be used for production of high quality diesel oil and jet fuel and the feed for reforming and ethylene cracking unit.